querySelector vs querySelectorAll vs getElementById vs getElementsByClassName vs getElementsByTagName

JavaScript performance comparison

Revision 18 of this test case created

Preparation code

<p id="foo" class="foo">
  <span class="bar"><span>,,,</span></span>
</p>

Preparation code output

,,,

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Testing in unknown unknown
Test Ops/sec
querySelector Class
document.querySelector("#foo .bar span");
pending…
querySelectorAll Class
document.querySelectorAll("#foo .bar span");
pending…
querySelector Id
document.querySelector("#foo");
pending…
querySelectorAll Id
document.querySelectorAll("#foo");
pending…
getelementid
document.getElementById("#foo");
pending…

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